Improvement in grates for furnaces



L,P.R1DER. GRATES F011 FURNACES, &c.,

Paten teluly 17, 1877.

UNITED ,L,EMIAN.VP. .RIDER,,OF P LTTSBURG, PENNSYLVANIAQ IMPR;O VEMENT IN GRATESFOR FURNACES, &c.

Specification forming part of Letters Patent No. 193,18R, datedJuly 17., 1877; application filed February 8, 1877.

CASE A.

T0 all whom it may concem:

Be it known that I, LEMAN P. RIDER, of Pittsburg, county ot Allegheny,and State of Pennsylvania, have invented a new and useful Improvement in Grates for Furnaces, Fire- Places, and Stoves; and I do herebg declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to an improvement in that class of grates for furnaces, fire-places,

. and stoves known as agitating-grftes; and

consists in the peculiar construction of the grate-bar, and in suspending them upon pivoted frames, the upper surface of the bars which support the grate-bars being on a hori zontal plane With the axis of the trunnions of said supporting frame, which trames are coupled together by a connecting-iod, whereby alternate bars of the grate can be elevated horizontally above their normal plane, and parallel therewith, for th purpose of Stirring the burning fuel, freeing the grate from the refuse of combustion, whereby air will be freely admitted among the particles of the burning fuel and the gases generated thereirom.

T0 enable others skilled in the art to make and use my invention, I will proceed t0 describe its construction and operation.

In the accompanying draWings, which form part of my specification, Figure 1 is a side view of the grate-bar. Fig. 2 is a top view of the same. Fig. 3 is a top view of the frame used for suspending the grate-bars and agi tating them. Fig. 4 is a side view of the furnace. Fig. 5 is a vertical section of the furnace.

In the accompanying drawings, Arepresents the grate-bars, having separating-ribs B and pendants 0, in which are curved apertnres 6 for the reception of the bars f and t'of the frame represented in Fig. 3, which irame is pivoted in suitable bearings, j and I, in the furnace-wall by means of the trunnions h, projecting from the end bars 9 of the frame. The bearings j are elongated for the purpose of allowing one of the trames to be moved slightly back and forward for the purpose of placin g the bars f and g in the apertnres 9 of the penda11t0 of the grate-bar, and also for the purp ose of removing tlie bars t and j from said apertures. The trunnions h are held in the bearings j, in the proper position, by means of a pivoted latch, la.

It will be observed that the aperture 6 of the pendants 0 of the grate-bars are curved, so that when the bars 5 and f (which forin continuons bearings for any number of grate-bars) are, in said apertures a positive action will be imparted to the bars in their downward movement aiter having been elevated.

When the grate-bars A are placed on the frame, With the bars f and i in the apertures 6 of the pendant 0, and the trunnions h forced back in the elongated bearings j, it will be impossible for the bars A to become displaced. The same resnlt may be obtained by making the elongated bearingj curved or angular, as represented, in the aperture 6 of the grate-bar A, which method of bearing will readily suggest itself to the skilled mechanic.

- From the frames which support the bars project two pendants, m, which are pivoted to a rod enlever, n, whereby the oprazor can impart a vibrating motion to the frames represented in Fig. 3, thereby alternately elevating the grate-bars above the normal plane of the giate, the upper surface of the elevated bars being paralle'l with the normal plane of the grate, (which is about a horizontal plane.)

By suspending the gratte-bars in the man ner and by the means hereinbefore described, a 'free and unobstructed admission of air around and between the grate-bars is obtained, securing results which are fully described in the patent allowed me December 8, 1876, to which reference is made, my present invention being au improvement and modification of the invention allowed me, as above recited.

Other forms of grate-bars maybe pivoted and suspended upon the frame represented in Fig. 3 without departing from the principle of operation hereinbefore described.

The width of the spaces between the bars will depend upon the thickness of the ribs B,

which ribs are also used as aguide for the bars, and also for the purpose of diminishing friction; hence they should be made narrow, so that their rubbing-faces will be of small area.

The upper surfaes of the bars f and} of the frames represented in Fig.- 3 are ori a l1ofizbfltal lino With the axis of me trriii0 i. By this arrangement of the bars with relation to the axis of oscillation of the supporting=frames, the grate-bars Will be elevated and lowered horizontall and V6itiasll vtfi th lt S-' sible motion endwise. 4

The advantages of oonstructing a grate as hereinbefore described i= fi1ll and lalrl' set'forth in my application, Whih has been allowed, and to which reference is made.

Having thus described m'y invention, what I claim is Shown, in combination with .the grate-bars A,

3. The elongatod bearing j and latch k, in

as and for the purpose set forth.

V L. P. RIDER. Witmesses:

A. G. JOHNSTON, WESLEY J OHNSTON. 

